Notes For V3.1-0

RESTRICTION: The FP15 and XVM features of the PDP-15 are only partially
debugged.  Do NOT enable these features for normal operations.

1. New Features in 3.1-0

1.1 SCP and libraries

- Added simulated Ethernet support for VMS, FreeBSD, Mac OS/X.
- Added status return to tmxr_putc_ln.
- Added sim_putchar_s to handle possible output stalls.

1.2 All DECtapes

- Added "DECtape off reel" error stop.

1.3 All Asynchronous Consoles

- Added support for output congestion stall if using a Telnet connection.

1.4 PDP-1

- Added Type 23 parallel drum support.

1.5 PDP-8

- Added instruction history.
- Added TSC8-75 option support for ETOS.
- Added TD8E DECtape support.

1.6 PDP-18b

- Added instruction history.
- Changed PDP-9, PDP-15 API default to enabled.

1.7 PDP-11

- Added support for 18b only Qbus devices.
- Formalized bus and addressing definitions.
- Added control to enable/disable autoconfiguration.
- Added stub support for second Unibus Ethernet controller.

1.7 Interdata 32b

- Added instruction history.

1.8 Eclipse

- Added floating point support.
- Added programmable interval timer support.

1.9 H316

- Added DMA/DMC support.
- Added fixed head disk support.
- Added moving head disk support.
- Added magtape support.

1.10 IBM 1130 (Brian Knittel)

- Added support for physical card reader, using the Cardread
interface (www.ibm1130.org/sim/downloads).
- Added support for physical printer (flushes output buffer after
each line).

2. Bugs Fixed in 3.1-0

2.1 SCP and libraries

- Fixed numerous bugs in Ethernet library.

2.2 All DECtapes

- Fixed reverse checksum value in 'read all' mode.
- Simplified (and sped up) timing.

2.3 PDP-8

- Fixed bug in RX28 read status (found by Charles Dickman).
- Fixed RX28 double density write.

2.4 PDP-18b

- Fixed autoincrement bug in PDP-4, PDP-7, PDP-9.

2.5 PDP-11/VAX

- Revised RQ MB->LBN conversion for greater accuracy.
- Fixed bug in IO configuration (found by David Hittner).
- Fixed bug with multiple RQ RAUSER drives.
- Fixed bug in second Qbus Ethernet controller interrupts.

2.6 Nova/Eclipse

- Fixed bugs in DKP flag clear, map setup, map usage (Charles Owen).
- Fixed bug in MT, reset completes despite I/O reset (Charles Owen).
- Fixed bug in MT, space operations return word count (Charles Owen).

2.7 IBM 1130 (Brian Knittel)

- Fixed bug in setting carry bit in subtract and subtract double.
- Fixed timing problem in console printer simulation.

2.8 1620

- Fixed bug in branch digit (found by Dave Babcock).

3. New Features in 3.0 vs prior releases

3.1 SCP and Libraries

- Added ASSIGN/DEASSIGN (logical name) commands.
- Changed RESTORE to unconditionally detach files.
- Added E11 and TPC format support to magtape library.
- Fixed bug in SHOW CONNECTIONS.
- Added USE_ADDR64 support.

3.2 All magtapes

- Magtapes support SIMH format, E11 format, and TPC format (read only).
- SET <tape_unit> FORMAT=format sets the specified tape unit's format.
- SHOW <tape_unit> FORMAT displays the specified tape unit's format.
- Tape format can also be set as part of the ATTACH command, using
  the -F switch.

3.3 VAX

- VAX can be compiled without USE_INT64.
- If compiled with USE_INT64 and USE_ADDR64, RQ and TQ controllers support
  files > 2GB.
- VAX ROM has speed control (SET ROM DELAY/NODELAY).

3.4 PDP-1

- Added block loader format support to LOAD.
- Changed BOOT PTR to allow loading of all of the first bank of memory.
- The LOAD command takes an optional argument specifying the memory field
  to be loaded.
- The PTR BOOT command takes its starting memory field from the TA (address
  switch) register.

3.5 PDP-18b Family

- Added PDP-4 EAE support.
- Added PDP-15 FP15 support.
- Added PDP-15 XVM support.
- Added PDP-15 "re-entrancy ECO".
- Added PDP-7, PDP-9, PDP-15 hardware RIM loader support in BOOT PTR.

4. Bugs Fixed in 3.0 vs prior releases

4.1 SCP and Libraries

- Fixed end of file problem in dep, idep.
- Fixed handling of trailing spaces in dep, idep.

4.2 VAX

- Fixed CVTfi bug: integer overflow not set if exponent out of range
- Fixed EMODx bugs:
  o First and second operands reversed
  o Separated fraction received wrong exponent
  o Overflow calculation on separated integer incorrect
  o Fraction not set to zero if exponent out of range
- Fixed interval timer and ROM access to pass power-up self-test even on very
  fast host processors (fixes from Mark Pizzolato).
- Fixed bug in user disk size (found by Chaskiel M Grundman).

4.3 1401

- Fixed mnemonic, instruction lengths, and reverse scan length check bug for MCS.
- Fixed MCE bug, BS off by 1 if zero suppress.
- Fixed chaining bug, D lost if return to SCP.
- Fixed H branch, branch occurs after continue.
- Added check for invalid 8 character MCW, LCA.
- Fixed magtape load-mode end of record response.
- Revised fetch to model hardware more closely.
- Fixed tape read end-of-record handling based on real 1401.
- Added diagnostic read (space forward).

4.4 Nova

- Fixed DSK variable size interaction with restore.
- Fixed bug in DSK set size routine.

4.5 PDP-1

- Fixed DT variable size interaction with restore.
- Updated CPU, line printer, standard devices to detect indefinite I/O wait.
- Fixed incorrect logical, missing activate, break in drum simulator.
- Fixed bugs in instruction decoding, overprinting for line printer.
- Fixed system hang if continue after PTR error.
- Fixed PTR to start/stop on successive rpa instructions.

4.6 PDP-11

- Fixed DT variable size interaction with restore.
- Fixed bug in MMR1 update (found by Tim Stark).
- Added XQ features and fixed bugs:
  o Corrected XQ interrupts on IE state transition (code by Tom Evans).
  o Added XQ interrupt clear on soft reset.
  o Removed XQ interrupt when setting XL or RL (multiple people).
  o Added SET/SHOW XQ STATS.
  o Added SHOW XQ FILTERS.
  o Added ability to split received packet into multiple buffers.
  o Added explicit runt and giant packet processing.
- Fixed bug in user disk size (found by Chaskiel M Grundman).

4.7 PDP-18B

- Fixed DT, RF variable size interaction with restore.
- Fixed MT bug in MTTR.
- Fixed bug in PDP-4 line printer overprinting.
- Fixed bug in PDP-15 memory protect/skip interaction.
- Fixed bug in RF set size routine.
- Increased PTP TIME for PDP-15 operating systems.
- Fixed priorities in PDP-15 API (differs from PDP-9).
- Fixed sign handling in PDP-15 EAE unsigned mul/div (differs from PDP-9).
- Fixed bug in CAF, clears API subsystem.

4.8 PDP-8

- Fixed DT, DF, RF, RX variable size interaction with restore.
- Fixed MT bug in SKTR.
- Fixed bug in DF, RF set size routine.

4.9 HP2100

- Fixed bug in DP (13210A controller only), DQ read status.
- Fixed bug in DP, DQ seek complete.
- Fixed DR drum sizes.
- Fixed DR variable capacity interaction with SAVE/RESTORE.

4.10 GRI

- Fixed bug in SC queue pointer management.

4.11 PDP-10

- Fixed bug in RP read header.

4.12 Ibm1130

- Fixed bugs found by APL 1130.

4.13 Altairz80

- Fixed bug in real-time clock on Windows host.

4.14 1620

- Fixed bug in immediate index add (found by Michael Short).

PDP11/pdp11_cpu.c

@@ -1,6 +1,6 @@
 /* pdp11_cpu.c: PDP-11 CPU simulator
 
-   Copyright (c) 1993-2003, Robert M Supnik
+   Copyright (c) 1993-2004, Robert M Supnik
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
@@ -25,6 +25,8 @@
 
    cpu		PDP-11 CPU (J-11 microprocessor)
 
+   29-Dec-03	RMS	Formalized 18b Qbus support
+   21-Dec-03	RMS	Added autoconfiguration controls
    05-Jun-03	RMS	Fixed bugs in memory size table
    12-Mar-03	RMS	Added logical name support
    01-Feb-03	RMS	Changed R display to follow PSW<rs>, added SP display
@@ -276,6 +278,7 @@ int32 stop_vecabort = 1;				/* stop on vec abort */
 int32 stop_spabort = 1;					/* stop on SP abort */
 int32 wait_enable = 0;					/* wait state enable */
 int32 cpu_log = 0;					/* logging */
+int32 autcon_enb = 1;					/* autoconfig enable */
 uint16 pcq[PCQ_SIZE] = { 0 };				/* PC queue */
 int32 pcq_p = 0;					/* PC queue ptr */
 REG *pcq_r = NULL;					/* PC queue reg ptr */
@@ -323,6 +326,8 @@ void set_r_display (int32 rs, int32 cm);
 
 extern t_stat build_dib_tab (int32 ubm);
 extern t_stat show_iospace (FILE *st, UNIT *uptr, int32 val, void *desc);
+extern t_stat set_autocon (UNIT *uptr, int32 val, char *cptr, void *desc);
+extern t_stat show_autocon (FILE *st, UNIT *uptr, int32 val, void *desc);
 extern t_stat iopageR (int32 *data, uint32 addr, int32 access);
 extern t_stat iopageW (int32 data, uint32 addr, int32 access);
 extern int32 calc_ints (int32 nipl, int32 trq);
@@ -532,6 +537,7 @@ REG cpu_reg[] = {
 	{ GRDATA (UDPAR7, APRFILE[077], 8, 16, 16) },
 	{ GRDATA (UDPDR7, APRFILE[077], 8, 16, 0) },
 	{ BRDATA (UBMAP, ub_map, 8, 22, UBM_LNT_LW) },
+	{ FLDATA (AUTOCON, autcon_enb, 0), REG_HRO },
 	{ BRDATA (PCQ, pcq, 8, 16, PCQ_SIZE), REG_RO+REG_CIRC },
 	{ ORDATA (PCQP, pcq_p, 6), REG_HRO },
 	{ ORDATA (WRU, sim_int_char, 8) },
@@ -539,10 +545,10 @@ REG cpu_reg[] = {
 	{ NULL}  };
 
 MTAB cpu_mod[] = {
-	{ UNIT_MAP, UNIT_18B, "18b addressing", "18B", NULL },
+	{ UNIT_MAP, UNIT_18B, "18b Unibus", "U18", &cpu_set_bus },
 	{ UNIT_MAP, UNIT_UBM, "22b Unibus + RH70", "URH70", &cpu_set_bus },
 	{ UNIT_MAP, UNIT_UBM + UNIT_RH11, "22b Unibus + RH11", "URH11", &cpu_set_bus },
-	{ UNIT_MAP, 0, "22b addressing", "22B", &cpu_set_bus },
+	{ UNIT_MAP, 0, "22b Qbus", "Q22", &cpu_set_bus },
 	{ UNIT_CIS, UNIT_CIS, "CIS", "CIS", NULL },
 	{ UNIT_CIS, 0, "no CIS", "NOCIS", NULL },
 	{ UNIT_MSIZE, 16384, NULL, "16K", &cpu_set_size},
@@ -566,6 +572,10 @@ MTAB cpu_mod[] = {
 	{ UNIT_MSIZE, 4186112, NULL, "4M", &cpu_set_size},
 	{ MTAB_XTD|MTAB_VDV|MTAB_NMO, 0, "IOSPACE", NULL,
 	  NULL, &show_iospace },
+	{ MTAB_XTD|MTAB_VDV, 1, "AUTOCONFIG", "AUTOCONFIG",
+	  &set_autocon, &show_autocon },
+	{ MTAB_XTD|MTAB_VDV, 0, NULL, "NOAUTOCONFIG",
+	  &set_autocon, NULL },
 	{ 0 }  };
 
 DEVICE cpu_dev = {
@@ -2467,23 +2477,24 @@ for (i = 0; i < clim; i = i + 2) nM[i >> 1] = M[i >> 1];
 free (M);
 M = nM;
 MEMSIZE = val;
-return cpu_set_bus (uptr, (cpu_unit.flags & UNIT_MAP) | 1, cptr, desc);  }
+return cpu_set_bus (uptr, cpu_unit.flags, cptr, desc);  }
 
 /* Bus configuration, disable Unibus or Qbus devices */
 
 t_stat cpu_set_bus (UNIT *uptr, int32 val, char *cptr, void *desc)
 {
 DEVICE *dptr;
-uint32 i, target;
+uint32 i, mask;
 
-if ((MEMSIZE <= UNIMEMSIZE) || (val & UNIT_18B) ||
-   (!(val & 1) && ((uint32) val == (cpu_unit.flags & UNIT_MAP)))) return SCPE_OK;
-if (val & UNIT_MAP) target = DEV_QBUS;			/* going to Ubus? */
-else target = DEV_UBUS;					/* going to Qbus */
+if ((val & UNIT_MAP) || (val & UNIT_18B))		/* Unibus variant? */
+	mask = DEV_UBUS;
+else if (MEMSIZE <= UNIMEMSIZE)				/* 18b Qbus? */
+	mask = DEV_QBUS | DEV_Q18;
+else mask = DEV_QBUS;					/* must be 22b */
 for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {
 	if ((dptr->flags & DEV_DISABLE) &&		/* disable-able? */
 	    !(dptr->flags & DEV_DIS) &&			/* enabled? */
-	    ((dptr->flags & (DEV_QBUS|DEV_UBUS)) == target)) {
+	    ((dptr->flags & mask) == 0)) {		/* not allowed? */
 	    printf ("Disabling %s\n", sim_dname (dptr));
 	    if (sim_log) fprintf (sim_log, "Disabling %s\n", sim_dname (dptr));
 	    dptr->flags = dptr->flags | DEV_DIS;  }  }